$OpenBSD: patch-packages_clib_nonblockio_h,v 1.1 2016/09/10 13:03:42 ajacoutot Exp $
--- packages/clib/nonblockio.h.orig	Sat Sep 10 11:42:58 2016
+++ packages/clib/nonblockio.h	Sat Sep 10 11:43:31 2016
@@ -52,6 +52,7 @@
 
 #else /*__WINDOWS__*/
 
+#include <sys/select.h> /* fd_set */
 #include <sys/types.h>
 #ifdef HAVE_SYS_TIME_H
 #include <sys/time.h>
